• WARNING: Tube/Valve amplifiers use potentially LETHAL HIGH VOLTAGES.
    Building, troubleshooting and testing of these amplifiers should only be
    performed by someone who is thoroughly familiar with
    the safety precautions around high voltages.

Current rating for power transformer.

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Here's what's shown on my 502a and my 502b transformers:

302/502a
2 – 110V Primary windings
2 – 6.3V, 4A Secondary windings with taps at 5V
1 – 6.3V, 3.5A Secondary winding
1 – 70V, 100mA Secondary winding
1 – 370V, 500mA Secondary winding with taps at 10V and 350V

302/502b
2 – 115V Primary windings
2 – 6.3V, 4A Secondary windings
1 – 6.3V, 3.5A Secondary winding
1 – 70V, 100mA Secondary winding
1 – 370V, 500mA Secondary winding with taps at 10V and 350V
 
Jolida 502a Power Transformer

You're welcome. On the 302 and 502's the rating are printed on the bottom of the transformer.
 

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Hi Ronald , thank you for all your help with the transformer details, but can I ask one small favour of you, is it possible to measure the distance between the bolts that hold it to the chassis. The distance horizontal, vertical and diagonal . Many many thanks Regards Ian
 
Hi Ronald, thank you for your last email, sorry for the late reply, but with one thing and another it's been quite busy here. Thanks for the measurements. Well once I can get a transformer made up I can start a build of my own. Again many thanks for your help. Regards Ian .
 
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